/**
 * Copyright 1996 self.com.au
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. (http://www.apache.org/licenses/LICENSE-2.0)
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed 
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for 
 * the specific language governing permissions and limitations under the License.
 *
 * <dhamma-message src="Atisha (11th century Tibetan Buddhist master)">
 * 	The greatest achievement is selflessness. The greatest worth is self-mastery.
 * 	The greatest quality is seeking to serve others. The greatest precept is continual awareness.
 * 	The greatest medicine is the emptiness of everything. The greatest action is not conforming with the worlds ways.
 * 	The greatest magic is transmuting the passions. The greatest generosity is non-attachment.
 * 	The greatest goodness is a peaceful mind. The greatest patience is humility.
 * 	The greatest effort is not concerned with results. The greatest meditation is a mind that lets go.
 * 	The greatest wisdom is seeing through appearances. 
 * </dhamma-message>
 *
 * @author Ashin Wimalajeewa
 *
 * Note, this is a very old runtime library that I have evolved since 1996. I rarely use it
 * now because the Apache Commons project has made it obsolete.
 */
/*
 * $Header: /usr/local/cvs_rep/self_lib/self/servlet/filter/Dump.java,v 1.1.1.1 2002/08/21 12:55:07 ash Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2002/08/21 12:55:07 $
 */
package self.servlet.filter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

/**
 * Filter to provide a log of SVN requests and responses.
 */

public final class SvnFilter implements Filter {

    private static final Logger LOGGER = Logger.getLogger(SvnFilter.class);

    /**
     * Place this filter into service.
     * @param filterConfig The filter configuration object
     */
    public void init(FilterConfig config) throws ServletException {
        // do nothing
    }

    /**
     * Take this filter out of service.
     */
    public void destroy() {
        // do nothing
    }

    /**
     * filter a request
     */
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain)
	throws IOException, ServletException {

        // wrap both request and response
        HttpServletResponse httpServletResponse = (HttpServletResponse)response;
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        SvnResponseWrapper wrapper = new SvnResponseWrapper(httpServletResponse);
        SvnRequestWrapper reqwrapper = new SvnRequestWrapper(httpServletRequest);

        // pass down the chain
        try {
            chain.doFilter(reqwrapper, wrapper);
        } catch (IOException ioE) {
            LOGGER.info("Request [" + reqwrapper.getMethod() + "] <" + reqwrapper.getPathInfo() + "> " + reqwrapper.getContent());
            LOGGER.error(ioE, ioE);
            throw ioE;
        } catch (ServletException sE) {
            LOGGER.info("Request [" + reqwrapper.getMethod() + "] <" + reqwrapper.getPathInfo() + "> " + reqwrapper.getContent());
            LOGGER.error(sE, sE.getCause());
            throw sE;
        } catch (RuntimeException rE) {
            LOGGER.info("Request [" + reqwrapper.getMethod() + "] <" + reqwrapper.getPathInfo() + "> " + reqwrapper.getContent());
            LOGGER.error(rE, rE);
            throw rE;
        }

        // prepare response
        String pageContent = wrapper.toString();
        String contentType = wrapper.getContentType();
        httpServletResponse.setContentType(contentType);
        httpServletResponse.setContentLength(pageContent.length());

        // log request and response
        LOGGER.info("Request [" + reqwrapper.getMethod() + "] <" + reqwrapper.getPathInfo() + "> " + reqwrapper.getContent());
        LOGGER.info("Response Content:" + pageContent);

        // send response
        PrintWriter out = httpServletResponse.getWriter();
        out.write(pageContent);
        out.close();
    }
}

